While you immediately feel the hot air blowing from a conventional forced-air heating system, an underfloor heating system takes a bit longer to warm up. (Once running, of course, the underfloor heat is more consistent and effective.)

Keep in mind that marble floors need to be sealed and maintained on a regular basis if you want them to look beautiful for a long time and to also last longer. The living room is not exactly a space where you can make compromises so be prepared.